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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cf9a697d6150d087c1a29cf21b80dd4eaba9ae8564d8311e9c7cbdbfded3f4' 
  AND token = 'kc+3Fh+aKSMlAEHGMUcZh+MiD6XZXFe4SiCA35nhJ5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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