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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c5c9b0048eae57497d864499d397b636055cba8f8dd8bc05e76e6270e58eb7' 
  AND token = 'NO6mGdyySh/hsB3KwEGsvw3ALYiSx63rIdPBtTxxf4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}