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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d09a5bde5fa9bc6354021e0105a882f10067cc6a2e2229bc083a51d1fa3f59' 
  AND token = '5PN8EWMetN44y52XCouNzCMgdEQiW3xF6zPLRGXvVx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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