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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50190808d3bc023024c8a83575d9190feccaed1d5ed0e5559086418556ef7f41' 
  AND token = 'KdMgspP9/D2n+wTNNf3O8riNQl0HTFPV9Kbpj21cs2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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