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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009d558603217fcccd0a20b1fc6d2e1029ff25d13b4bdfafbcc2a9cf1b2d3748' 
  AND token = 'g+k0MPP82t0gy3oPolyVPem5w07qsQCNunDTK2w7UxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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