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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f52b936c2d5387f435ceaeaf188d2aad2c5a71bb12d63a9411a9eb83ea9821' 
  AND token = 'UsRU7mTUcac3nPTNAX7KGMqU2pJ1+vSMB0euEuuL1Yg=' 
  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"
    }
  }
}