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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684ba8fd6a89f6ee08b4b9241453c1e521140dd228c3fc060aa1d35a3eff04c2' 
  AND token = 'wEJGacdANx8C0zYiuhTAQ0n1GmtNas6Ik60TxsOapkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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