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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5306419c6021a42c2b14299a2fddb75dd1481a09cd0e3ed45b75bb1c1b48b6c4' 
  AND token = 'dGAxcf5OU1eJWeUgN5YYqTyggXpCe7gBAVUVbvAisQc=' 
  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"
    }
  }
}