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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b90b738f85062ededc2661ca24e66c246d7bda8e395b2a4a90369723e38c13b' 
  AND token = 'njIZ2bf4FPkozvdzegH0KBYjJjmC96tf6rFSCC8eIAY=' 
  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"
    }
  }
}