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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9609fb9b7a7dc9633292e6c91c68bf600332932059453e793d392ced582a7781' 
  AND token = 'VXPb38vlx7NpRmLdkN8z6JQj6b75Yr32KwQM5emukYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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