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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1136c977a7c0e99ceff2193fc4f12763b8d92ecfacb3ddddf62ef6db11369b' 
  AND token = 'Tx7tJf75S0dPAF8oE0ext00apgJc8AZJv6++yJXkNlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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