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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd194ccf53e959512e0a6bb9eff4880ece8c73f14e3cc460fbbd4f28f2971e79' 
  AND token = 'dcpdHR2bY/1t9etBGEldRsbGlZQ5eHcKOrx1H2nhFwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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