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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb138a368755b2187419e1d7c5a4253d7c6aaca8f39f60ed5558a39faf68c32' 
  AND token = 'mkZt1r+5kbFYeQ8+Sjez4JxgTdco/ly2BXMfSeNh3KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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