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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab84aae9b21211d3bf9d68c0920e4c312d9948bfe939b838bf080af9b5ff372e' 
  AND token = 'eHlnRsIsChHwXoQDi5dmKvkhsucGJEs+kg7o+Amr+6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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