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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff3f4d45a07aef610aa79253521d78af9f5e09157d1c47dd8e5cb1834a8c191' 
  AND token = 'NB+GFsfwiUc5+5G0+AA2gy8WYp/3iN7fUjDoXEoH5Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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