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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b96e3457cc34f5e8b413383bbdc80d55afffc762ef8f7b3c08ada16ff530fd' 
  AND token = 'U6uCwyk9hGRoL4W6uDJpofAEP6HM48rHbNySCKkCYto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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