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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672ab03611437e2fabdf98ca30d916008a59d4e543aab011422ed1b84414ea2a' 
  AND token = 'G9kc0cl9l4ru8KezsEnQV3oZ0cIQOMSD9z2zGBVTDDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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