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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3359442ba4c1a88a1cfe25b459a4cfd7c4fbbdb6f9e14605aca056d3e59095fe' 
  AND token = 'Vd0G4FE/gTvE+T2oHOjDApFhtjbX6XZfU7PQIzE50no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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