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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a836caa9a84b1157d5f49cf84c8535e61d2fb9a1aefb6364984ed7183d9acd76' 
  AND token = 'g7T76P1p0aBOAuaGwTxdje0sPik67KyMV98vADTiVxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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