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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b995f0932f555fe5163d7078043146d449aae7fd4cff9491ddf49c2944e85ac9' 
  AND token = 'fZsTkw61lM0ACoz96sPbJTrzhlFljy6Bk/kXZtBW7+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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