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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaaeb8fb8c45f3c08d965b1da67111b8a75fae95a44366029641cf5e6f553987' 
  AND token = '6mQfa/F9VPLRud0aLjQJtGpO6RfMS4BkNrcJKvqB9C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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