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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603f13fde74e30e3d6e425c206c980bda0a8765ee178042d0c571091ac4f6561' 
  AND token = 'RwzQDKfv3IsJX6V2T0Sg8qt9bANBeIa/dZGGHdNF3q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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