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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3d5038fd21936f06f07b663b2e6c6ac3502ef33a4a42188ee458a449ae5989' 
  AND token = 't4LqYLwUOmNNQDv36PDwlhCH+KuGtX4pu7T76nDcRj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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