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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c132d3df5d88d144d8bf866a64162cd5f9ba4376b9d0d4880aa837477abe1ae8' 
  AND token = 'BgbYB0FrcB+z4Bwrx6CLDzFgtpqLrNSCFMKsQGtE8yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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