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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da08b93ca5fc986e0487498280de9687e47ee429b625174d8a8eac74210855e7' 
  AND token = 'Pa7Cxl6uHnQT1UKZ7X8jTe1uMYcqpYSDeRELwpGN2/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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