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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2739e471f39f4ae6d1269edd4021a3570160396d9a0809e03f608bd3f6f9f3' 
  AND token = 'kXhS5riJH+9t8/sV0EQcnSsvoQ/7SN174tbZcaBcSEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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