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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5ff5c15390419915640a440e58a75db3ff899945ce92325f4dcfb34993c503' 
  AND token = '4CnE5uDJ7XaauE4redJEV6SJRgRG3hX1X5BwEiQ3Hgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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