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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d82494b4a4481098f33430ae0103ffb2b7989a0182897bcae6778fa5244d14' 
  AND token = 'YBB7NsdTGgES3f2mCPRzFoWiTSIW/HulT8saP9CzL0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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