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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953958998a8a472c75e4fbf598c6a3be2a19a0ff139cc0de82db6c17aaaf0e83' 
  AND token = 'W26agT6In7ngm6mB1GnkdMorqsl3m3zJifRVyyiUMo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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