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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbde63df8ab7f0fecd1497693af7d3797454b02cc667f535f1400edee065ad83' 
  AND token = 'jlvlGm5XpeYS7DA/2MOP0F4ykafo42fFcqfkLQUaUt0=' 
  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"
    }
  }
}