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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52fc9acd71b4984ce89b5c7c9dbb0af78699745c5a307f9708719e6f5f2805a1' 
  AND token = 'UbnhP6b97l6/JNufFubeWlSt6jGoKS1ismE7k8RqXe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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