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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa864268749b30c6c3aa907fa93bd13b501dd69e03ea207ff2e6861cf87613e4' 
  AND token = 'ss5y8rRIN3r2ilmmyiV8TfKY5VM3S5+4zp/cW1C5TO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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