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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b050eb92a86f6c9f924146716eb14046fc471f22a737aec435b7d09a2846e5' 
  AND token = 'EtR6qBs5sTmLmWHEzvHM01i5nxSa4du2UAeuitruAUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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