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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a172f79a0d1daf9c10f1271e6779eb4b4f8045b30124ef282439e604c0658bb' 
  AND token = 'L/kNjNm7ENq0Xhz0k8oyMeMGEeiLj1f+KQvOR0c1SJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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