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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712d50cb4ec7321d6012a5368ffd0ff36ab3a124077c8ef7dc1e47619bb1c3f9' 
  AND token = '6HOEx5Mz6ukVp9vEutDzUaiKwqVkaJWDjhmWjAS3WCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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