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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e100ae0457e45794ac196b202b5a03dbf20bda867f603b7eca10d093e41ee0ec' 
  AND token = 'Y4XhxcMClugMXPCjH2x7zHQGurksCGMWtzf2gWVXnU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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