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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a73dee7925978dfa8ba8692f536e58cf8bca4efcba8cc7609f42c9a0807859b' 
  AND token = 'ZOjpoYkU+dsHWNAfbv32Rq52LA4OMfjF2paQ5vocwno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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