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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7bdb1d0a38b33888f621d2d0070bb76384f02e502697fc6f03caf28f4e0a83' 
  AND token = 'xksXwldhRTa0CM3fZzxrlsbITYRTJ6q15oh07y6kKXM=' 
  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"
    }
  }
}