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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0773348175279b0bd17ebefe277863d99f1fe46b19f9473e43fb3d93e1eb732' 
  AND token = 'bW4d+aD7nFFQ2E+loDu14YXkpWym3B6FI1TXvt5Em/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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