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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c018f2a1f3f57f66afdd40012a3d92f71cac6be71a4289467d845da2210d09d' 
  AND token = 'hRFwlM8OKQWiyzBud62MdMyBR/5QCMS2kDgF4LlflCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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