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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a36f203b4cba47798143c6221e68d1a38975ce676d7231353c9f643d940bea' 
  AND token = 'I0FP7mfQ2fP7fbYBYE38AHVCdgRWz8HoNZqUGR9GPmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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