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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e017676ffaaf5f703ca0d41bf45abe444431eadc5123a363ffbf6516df22f03' 
  AND token = 'eEQBfx8p5zeT4jXvVxwHaYqnUj6K0dXT30lGEBa+Hv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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