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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c0d47577b0f6bd0a3137fb3a85d7e741e7a32293b8cb44f095a2c2491d944c' 
  AND token = 'OzgjpQkxaaI4hvngcd0BqFsb+F9XoQEY0FQm7g+9LDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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