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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c537565e95dc7fcedbcc2ce0d5084a51253d539c01d7e5e8e4838b8cf1cf8e45' 
  AND token = 'qcRkvg01L/IPNBRVQ1t0fo/0NyMIQH4p7hLvK6LS9oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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