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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ab45d93f29148c35f89a0cc85b3bda2fde04bb17bdd5d5820e636d29991657' 
  AND token = 'adR0B2/L4i52A5Pc0fSlWb/fEy9LEhkbF5auTyW8yUo=' 
  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"
    }
  }
}