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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7745e81085b88f9811977f2bbcfa5af1f3c3ab743b97d8a5174a89b7c14d7806' 
  AND token = 'pEMsvLYccg8pSLg95QGaJ752QZnl3Nv066qTPX3Ln/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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