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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f759ac50546780df17b866d5689d3d7178b7a020fe2fca94a7bce4ed97c4d2e4' 
  AND token = '1JzENJ6G3y+fKlYJ59zRz9kt5zHzZPgKdL6GtH50oxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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