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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c84b16be6a4d156ab7eb474cd070cdf3be55a826c978af6d6e25b49a63de87b' 
  AND token = 'DFUB5krN1UhDEVA8K2oXeLZWWimQEBZhgFw8mcCB70o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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