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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0516a5eebed3629c2f2512c001c35340afb6487a5bf5d3797ee529796b7924' 
  AND token = 'KJSS6abxdxHlJfdR8U9FIfEQ/R1nuEK7sZHY+UkUCJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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