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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df711dfe5177cfa10c424f42b384dc46578c945b1dc0c6246852a16d492a392' 
  AND token = 'mm5EMsFS97wodOvW5Bh7JfXTgh6tjnmelcpe4HINI/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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