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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d232acc08168daeb6e7d0973ec88db06d3b8e15ac920c2ab2dc82c7f97585d5' 
  AND token = 'W1OGRdVVXdpKAbvbUyxbSe+Kh4MPJ21VyayRWOurYb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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