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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44cf9dce938ac2bd1c6ba563cb470607042d1b00a7c627d7f7a44aaee6cdf4be' 
  AND token = 'GburKM/6YtMKHHE3CHLLMDuJ3dFTo6jMVlXtdchsawY=' 
  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"
    }
  }
}