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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35adc42c75f8f08a10371e6760db61d036aea33c03a2b0b663724fa7736e290' 
  AND token = 'f5aFBsl71mIGYuSMD9A8InKkAetpZbxQ5n9oOLfFhOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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